Dear Tobias Sir,
It is true that “The Jaya Sri Maha Bodhi CAN NOT be destroyed by anything or anyone in the universe”.
At the end of this Buddha Sasana, the Jaya Sri Maha Bodhi along with all the relics of Lord Buddha will disappear automatically. Before that time, they CAN NOT be destroyed. It is impossible to destroy or harm them.
As long as the Jaya Sri Maha Bodhi and the relics of Lord Buddha are present, the Jati Sotapannas will keep coming to this human world and the Buddha Sasana will be kept alive (because the conducive environment for attaining Nibbana is provided by the “Immeasurable and Pure Buddha Energy” continuously coming from the Jaya Sri Maha Bodhi).
But after the disappearance of the Jaya Sri Maha Bodhi and Lord Buddha’s relics, the necessary environment for attaining Nibbana will be gone and hence no Jati Sotapanna can come to this human world. This will mark the end of the Buddha Sasana of Lord Gotama Buddha. (even though the Tipitaka would be present but the Buddha Sasana would disappear from the human world)
I hope it helped to answer your questions.
